Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 4, Pages 3940-3948Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00322
Keywords
black TiO2; titanium oxide (TiO2); solution plasma synthesis; radicals; water evaporation; solar energy utilization; nanoparticles; surface treatment
Funding
- JSPS KAKENHI [20H00295]
- Center for Advanced Research of Energy and Materials (CAREM), Faculty of Engineering, Hokkaido University
- Nanotechnology Platform program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Grants-in-Aid for Scientific Research [20H00295] Funding Source: KAKEN
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Black TiO2 nanoparticles (b-TiO2) with superior solar-thermal water evaporation performance were prepared using a one-step solution plasma process (SPP). Radicals generated during SPP played a critical role in b-TiO2 formation, with a two-step mechanism proposed for its synthesis. The understanding gained from this study may inspire strategies for more efficient solar energy harvesting in solar-thermal conversion applications.
Black TiO2 nanoparticles (b-TiO2) with superior solar-thermal water evaporation performance are prepared using a one-step solution plasma process (SPP) in ambient conditions. It is found that radicals that are generated during SPP play a critical role in b-TiO2 formation by comparing several water-alcohol electrolyte environments for the SPP synthesis. Our results show that the radical-induced formation of a black TiO2- x layer on the Ti electrode is necessary for bTiO(2) formation, which was ignored in previous studies. A two-step mechanism for b-TiO2 formation in SPP synthesis is proposed: (I) preoxidation of a Ti electrode surface; and (II) quenching and aggregation of sputtered molten TiOx clusters to form b-TiO2 particles. The b-TiO2-loaded hydrophobic mesh exhibited high water evaporation rates in the solar-thermal water evaporation experiments, which were 1.2, 1.4, and 2.3 times higher than that of the control group without using mesh at 1000, 2000, and 5000 W.m(-2), respectively. The understanding in this study may inspire strategies for the facile synthesis of self-structured modified metal-oxide materials for more efficient solar energy harvesting in solar-thermal conversion applications.
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